(19)

(11)

EP 0 656 155 A1

(12)

(43) Date of publication: 07.06.1995 Bulletin 1995/23 (21) Application number: 93918063.0 (22) Date of filing: 20.08.1993

(51) International Patent Classification (IPC):  G02F 1/ 35( . ) H01S 3/ 067( . ) H01S 3/ 10( . ) H01S 3/ 094( . ) H01S 3/ 06( . ) H01S 3/ 07( . ) H01S 3/ 13( . ) (86) International application number: PCT/GB1993/001771 (87) International publication number: WO 1994/005061 (03.03.1994 Gazette 1994/06)

(84) Designated Contracting States: DE FR GB (30) Priority: 20.08.1992 GB 19920017706 (71) Applicant: BT&D TECHNOLOGIES LTD. Bracknell, Berkshire RG12 1HN (GB)	(72) Inventors: FAKE, Michael 85 Mumford Road Colchester Essex CO6 3BN (GB) HARKER, Andrew, Thomas 43 Clarkson Street Suffolk IP1 2JN (GB) (74) Representative: Webster, Denise Mary  Hewlett-Packard Ltd, IP Section, Building 2, Filton Road, Stoke Gifford Bristol BS12 6QZ Bristol BS12 6QZ (GB)